WESTport Corporation offers a complete range of GO/NOGO Hex plug gages manufactured to ANSI/ASME specifications with in fractional sizes from .028" to 3.00" and metric sizes from .70mm to 75.00mm. The standard covers dimensional data for various types of hexagon and spline socket cap screws, shoulder screws, set screws, and hexagon and spline keys recognized as the American Standard. Gages are manufactured from oil hardened tool steel with a minimum HRC of 60 HRC. Hex gages are perfect for inspecting machine head fasteners. WESTport Corporation can also build custom hex plug gages per customer specifications.